Electric furnace.



R. McKNIGHT,

ELECTRIC FURNACE.

APPLICATION FILED we. 2a, 1906.

900,192. Patented 0012.6,1908.

B l 2 sums-$3M 1.

UNITED STATES PATENT OFFICE.

ELECTRIC FURNACE.

Specification of Letters Patent.

Patented Oct. 6, 1908.

Application filed August 28, 1906. $eria1No. 3B2,40i-L Toall whom' itmay concern.-

citizen of the United States, residing at liittsbur ,in the county ofAllegheny and State of ennsylvanimhave invented newand use fulImprovements in Electrical Furnaces, of

which the following is a specification.

My invention has relation to are roasting;- furnaces.

- I apply in my furnace a gaseous heat-carrier, sue-1 as a r or steam,which is super-- heated by passing it through an electrically heatedfire box. The furnace and fire-ho): are lined with retracting material,such as 21- good variety of porcelain or lire brick. and

'preferably, the fire box is so shaped and placed and the source of heattl'ierein so situated that heat rays thereupon are projectedSubstantially directly into the interior of the tubular 'f'uniace. Theheated air .01

' steam is moved tl'irough the lire box into the furnaceeither bypressure or suction. The latter is .ire'ferrcd.

Descri ing now in detail the best embodi- "mentof my device 0i which Iam at present aware: Figure 1 a vertical section of my invented device,and Fig. 2 is a side elcvotion' there-oi". Fig. is a cross sect on online X-X. Fig. i is a plan'vi w and Fig. 2 is a vertical section of ii.inorlifii'zd form of my invented device.

ng tubular character, and. r euo'ported. and. rotated in a suitablemanner. in the drawit rests upon rollers m, m, m, m, and is t 6. [itits: for; .1 and the lire driven bye. chain on the sproclining C: of asu l. si;-an that will. rel heat, such as a ,g'rm-d variety of porcelainor fire brick.

A chute 4 leads the ore into thev furnace. A

' series of ports 8, discharge the ore. These are arranged. along thecylindrical lornace body A. Any one or more of theee ports ma. beselected. as the discharge port or ports. hey are so made preferablythate. pocket is formed. at each portion which. the roasted ore is collectedthrough any suitable valved door,- not shown in the drawing, which doesnot allow the entcmd ore to escape back into the furnace, and from whichthe ore can The body A of the h rnace is of the rev ol'v I Be it knownthat 1, ROBERT ltlcliiw'ioi-i'r, 1:.

'tion, the tines 12-3. 13, are om Pi roasted ore and. the colic removedwithoutadmitting much colcl air 1 o the'lurnace. The fines 13, 13 are.ilaceil between the fire'brick lining and tho sllcll of the fiii'imce,with inlet ports '15, 15. These lines load to the liro-box. i-M1oloctricare or series oil: arcs is formed as between the electrodes g, g, g andIt, It, 7)., in the drawing. These electrodes can be ordinary carbonelectrodes and prc'l'cmlil arc cased ill the casing is which servos tovrolm-t lilwin from Contact. with the air, and of 1;. suitable 11011conductw of cli. ctr i(.-it such as porcelain; 'lhc fume esoiiw pipc lsci to carry oil the volatilize-(l products oi the roost. lt iivf ralilyopens into the box The c.\'-. luiust [an 13, serv to carry oll' if 0a"1. from the turner-- and at tl draw oil the hen box into and thro yghthe, it. A modification. o shown in Figs. l in vi 2.

admitted into the iiro-l '7, 7 n single port *5. i.

iii; pc- A much, cheaper and simpler pensed with. and elluiient device15 thus rorhlced, but one two than in which I. coneidor much icespreferred form.

The furnace can be operated in vflrlmie ways. The way in which Iopi-rrai-c it in Practice is as follows: 1 ass on electric cur-- rentthroi'lgh the elect-mo g, g, g and [la 13 ,21, and heat thoroughly thefire-box thou I. be gin to pass the heated air or steam through theluri'mce until by its pa. ego and by the heat reflected from thelire-box., as well as'l If the heat carried. into the hi oi the by themnvc' )Il currcii thus-Get 1.0. luriiacc is thorougrhiy liczitm l. .lthou tho orcinto the l'urnuco and pr-rrl'oim the omit-inning the passageof the hot am: or in into the fur-mime, and. (f-( )llE.(Jl/lllg and.iizohdensing in the vapors drawn oil', any

firebox, Jflaoed'at the end. of'said furnace body, a'n means for passinga: draft t iljfti'i'ugh the fire-box mm the furnace, substantially as.desoribed.

2. The combination with a rotating tu'bula'r-furnace bod of anelectrically heated fire box having 811' stantiall y a colloidal silage,Y,

placed at theend of the tubular furnace two i. and means for passing 10"fire-box into the "fn 'rnaoe'; snbstanti'ally as described.

The combination, with a rotating tubular furimce body admittil'iggaseous heat-carriers -and with electrodes in uxtaposltlon to produce anof 'z fire-bim. laced at the v end thereof and provided with inletfluesfor 15 electric-zero or series of aro'sover-between 01' near whichthese heat-carriers pass substan}v tially as described.

4. The combination of a revolving furnace an electrically heatedfire-box at the end t 1.1oreof and a series of ore'outlet' ports, situ..ated along-the s aid revolving furnace and means-for closing s'aidports; snbstantiallygs described. 7

In testimony 'Whereof Iaffixrny signature in presence of. twowitnesses.-

ROBERT M KNIGHT. Witnesses: ELIAS ELv'oNE,

WALT R S'BUTLER.

